(Again footwork. using knees and shoulders, moving from the centers of the body and not with the arms ...)
Can you get the same use out of your back arm when relaxing it or do you have to strech it out?
Are there teachers doing "Yamaguchi Aikido" (don't like that term) in the US?
Here's a clip of William Gleason teaching recently.
He was a long time Deshi of Yamaguchi, I believe.
Also, I saw this on TV the other night and I figured it's what Akuzawa gets up to on weekends.